#include <stdio.h>

#define MASS_PER_MOLE 3.0e-23
#define MASS_PER_QUART 950

int main(void)
{
    double hydrone, quart;

    printf("Please enter the number of quarts of water: ");
    scanf("%lf", &quart);

    hydrone = quart * MASS_PER_QUART / MASS_PER_MOLE;
    printf("OK,there have %e hydrone for the quarts of water.\n", hydrone);
    
    return 0;
}